Micro Quiz 2

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Sulfanillimide is an antimicrobial drug that mimics the shape of an important substrate for a particular bacterial enzyme, therby inhibiting the enzyme. This type of inhibition is known as:
A. a, b, and c
B. allosteric inhibition
C. both a and cD. competitive inhibition
E. excitatory allosteric control

D.

(this multiple choice question has been scrambled)

Which of the following is a true statement concerning the structure and function of ALL enzymes?
A. the higher the temerature, the faster an enzyme will workB. after an enzyme has catalyzed a reaction, it resumes its original shape and can interact with a new substrate molecule
C. competitive inhibition of an enzyme occurs when an inhibitor binds to an allosteric site on the eznyme
D. they must bind to cofactors in order to function
E. an apoenzyme is a combination of a cofactor bound to a holoenzyme

B.

(this multiple choice question has been scrambled)

All of the following are true statements concerning glycolysis EXCEPT:
A. it produces ATP by oxidative phosphorylation
B. it uses, as well as produces, ATP.
C. it involves the conversion of a molecule of glucose into two molecules of pyruvic acidD. it occurs in the cytoplasm of the cell
E. it is a pathway common to both respiration and fermentation

D.

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The molecule which an enzyme acts upon is known as its
A. coenzymeB. substrate
C. holoenzyme
D. apoenzyme
E. catalyst

B.

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In which of the following stages of glycolysis is ATP made?
A. both a and b
B. lysis stage
C. both b and c
D. energy-investment stageE. energy-conserving stage

E.

(this multiple choice question has been scrambled)

True/False: a metabolic reaction that creates large molecules from smaller reactant molecules is catabolic.

False

True/False: a molecule that receives an electron from another molecule has been reduced.

True

True/False: The donation of a pentose sugar to a molecule is known as phosphorylation.

False

True/False: the area of a holoenzyme where the reaction takes place is the allosteric site.

False

When a phosphate group is tansferred to a molecule from a phophorylated organic compound such as ATP, the transfer process is called
A. catabolic phosphorylation
B. photophosphorylation
C. oxidative phosphorylationD. substrate-level phosphorylation
E. reductative phosphorylation

D.

(this multiple choice question has been scrambled)

Enzymes that catalyze the transfer of electrons and/or hydrogen ions from one molecule to another are known as
A. lyases
B. hydrolases
C. isomerases
D. ligases (polymerases)E. oxireductases

E.

(this multiple choice question has been scrambled)

The protein portions of enzymes which need to bind with one or more cofactor before they can catalyze reaction are called
A. DNAses
B. holoenzymes
C. coenzymesD. apoenzymes
E. ribozymes

All of the following are true statements concerning cellular metabolism EXCEPT
A. ATP is used in the formation of macromolecules
B. the goal of metabolism is reproduction of the organism
C. enzymes are used in both catabolic and anbolic reactionsD. macromolecules are converted into cell structures via catabolism
E. energy obtained from nutrients or light is stored in the bonds of ATP

D.

(this multiple choice question has been scrambled)

True/False: The amount of energy released by a chemical reaction which has been catalyzed by an enzyme is known as its activation energy.

False

True/False: Enzymes function best within narrow ranges of temperature and pH.

True

True/False:When an inhibitor molecule binds to an enzyme's allosteric site, the shape of the active site changes so that substrate molecules can no longer bind.

Acetyl-Coenzyme A is formed directly from what molecule?
A. carbon dioxide
B. citric acidC. pyruvic acid
D. none of these
E. glucose

C.

(this multiple choice question has been scrambled)

Under ideal contitions, the complete aerobic oxidation of one molecule of glucose allows a net gain of how many ATP molecules?
A. 24
B. 4
C. 2D. 38
E. 0

D.

(this multiple choice question has been scrambled)

Which of these forms of phosphorylation is/are MOST applicable to the bacteria we'll sudy in this course?
A. a and bB. a and c
C. substrate-level phosphorylation
D. oxidative phosphorylation
E. photophosphorylation

B.

(this multiple choice question has been scrambled)

When a compound is oxidized, it
A. accepts (takes in) one or more electrons
B. gives away one or more protons
C. accepts (takes in) one or more neutrons
D. accepts (takes in) one or more protonsE. gives away one or more electrons

E.

(this multiple choice question has been scrambled)

Lab personnel use all of the following substances to determine which sugars a bacterium can catabolize EXCEPT
A. acidsB. nucleic acids
C. pH indicators
D. carbon dioxide

B.

(this multiple choice question has been scrambled)

All of the following are true statements concerning all enzymes EXCEPT
A. they form a temporary intermediate compound with a substrate
B. they are usually, but not always, proteins
C. they can be denatured if the pH of their environment is too high or too low
D. they can be used to catalyze a chemical reaction over and over againE. they function best at 370 C

E.

(this multiple choice question has been scrambled)

What type of inhibition occurs when a substance produced by a metabolic pathway attaches to an enzyme's allosteric site?
A. competitive inhibitionB. feedback inhibition
C. isolative inhibition
D. catabolic inhibition
E. none of these

B.

(this multiple choice question has been scrambled)

All of the following are true statements regarding fermentation EXCEPT
A. it starts with glycolysis
B. ethanol and lactic acid are possible productsC. the main goal is ATP production
D. the final electron acceptor is an organic molecule
E. NADH is oxidized